Legal claims defining the scope of protection, as filed with the USPTO.
1. A television comprising a display screen, a video enhancement unit coupled to the display screen and having a configuration to receive and process image frames of a video signal and output the processed image frames for display on the display screen, each of the image frames having a plurality of pixels distributed over a plurality of pixel levels, and a control unit coupled to the video enhancement unit, the control unit comprising programmable logic configured to determine for a set of pixels in a received image frame having a first distribution of pixels across a first plurality of pixel levels within a pre-determined range of grey pixel levels the number of pixels corresponding to individual pixel levels within the pre-determined range of grey pixel levels and instruct the video enhancement unit to expand the pixel level distribution of the set of pixels from the first distribution of pixels across the first plurality of pixel levels within the pre-determined range of grey pixel levels to a second distribution of pixels across a second plurality of pixel levels within a pre-determined range of grey pixel levels based on a percent level distribution of the set of pixels within the pre-determined range of grey pixel levels when displaying the image frame on the display screen.
2. The television of claim 1 further comprising a video pre-processor coupled to the video enhancement unit.
3. The television of claim 1 wherein the programmable logic comprises software executable on the control unit and stored in memory in the control unit.
4. The television of claim 1 wherein the programmable logic is further configured to calculate a pixel level range K as the pre-determined range of grey pixel levels, where K=Y h −Y l and Y h and Y l are pre-set values corresponding to the highest and lowest pixel level values.
5. The television of claim 1 wherein the programmable logic is further configured to calculate a pixel level range K as the pre-determined range of grey pixel levels, where K=Y h -Y l , where Y h and Y l correspond to the highest and lowest pixel level values where Y h =v*Y max and Y l =u*Y min , and where v<1 and u>1.
6. The television of claim 1 wherein the programmable logic is further configured to normalize each pixel level across the pre-determined range of grey pixel levels.
7. The television of claim 1 wherein to expand the pixel level distribution of the set of pixels the programmable logic is further configured to calculate the percentage of pixels out of the set of pixels at each pixel level within pre-determined range of grey pixel levels.
8. The television of claim 7 wherein to expand the pixel level distribution of the set of pixels the programmable logic is further configured to calculate a stack of the percentage of the pixels out of the set of pixels at each pixel level within pre-determined range of grey pixel levels.
9. The television of claim 8 wherein to expand the pixel level distribution of the set of pixels the programmable logic is further configured to normalize the pixel level range to the stack of percentages.
10. The television of claim 9 wherein to expand the pixel level distribution of the set of pixels the programmable logic is further configured to map each stack level comprising one or more stack blocks within the stack of percentages to a normalized pixel level within the normalized pixel range and reassign pixels corresponding to a stack block within the stack level to the normalized pixel level.
11. The television of claim 10 where in the programmable logic is further configure to apply a color correction factor to the expanded distribution of pixels.
12. A television comprising a display screen, a video enhancement unit coupled to the display screen and having a configuration to receive and process image frames of a video signal and output the processed image frames for display on the display screen, each of the image frames having a plurality of pixels distributed over a plurality of pixel levels, and a control unit coupled to the video enhancement unit, the control unit comprising programmable logic configured to count the number of pixels out of a set of pixels in the image frame having a first distribution of pixels across a first plurality of pixel levels within a pre-determined range of grey pixel levels corresponding to individual pixel levels within the pre-determined range of grey pixel levels and configured to calculate a stack of percentage distribution of the set of pixels based on a percent level distribution of the pixels within the pre-determined range of grey pixel levels, and configured to instruct the video enhancement u nit to expand the pixel level distribution of the set of pixels from the first distribution of pixels across the first plurality of pixel levels within the pre-determined range of grey pixel levels to a second distribution of pixels across a second plurality of pixel levels within a pre-determined range of grey pixel levels based on a stack percentage distribution of the set of pixels within the pre-determined range of grey pixel levels when d splaying the mage frame on the display screen.
13. The television of claim 12 further comprising a video pre-process or coupled to the video enhancement unit.
14. The television of claim 12 wherein the programmable logic is further configured to calculate a pixel level range K as the predetermined range of grey pixel levels, where K=Y h −Y l and Y h and Y l are pre-set values corresponding to the highest and lowest pixel level values.
15. The television of claim 12 wherein the programmable logic is further configured to calculate a pixel level range K as the predetermined range of grey pixel levels, where K=Y h −Y l , where Y h and Y l correspond to the highest and lowest pixel level values where Y h =v*Y max and Y l =u*Y min , and where v<1 and u>1.
16. The television of claim 12 wherein the programmable logic is further configured to normalize each pixel level across the predetermined range of grey pixel levels.
17. The television of claim 12 wherein to calculate a stack of percentage distribution of pixels the programmable logic is further configured to calculate percentage of the pixels out of the set of pixels at each pixel level within pre-determined range of grey pixel levels.
18. The television of claim 17 wherein to calculate a stack of percentage distribution of pixels the programmable logic is further configured to sum the percentage of percentage of the pixels out of the set of pixels at each pixel level within pre-determined range of grey pixel levels.
19. The television of claim 18 wherein to expand the pixel level distribution of set of pixels the programmable logic is further configured to normalize the pixel level range to the stack of percentages.
20. The television of claim 19 wherein the step of expanding the pixel level distribution of set of pixels includes dividing the normalized pixel level range into normalized pixel levels corresponding to the pixel levels in the predetermined pixel level range.
21. The television of claim 20 wherein to expand the pixel level distribution of the set of pixels the programmable logic is further configured to map stack levels comprising one or more percentage stacks within the stack of percentages to a normalized pixel level within the normalized pixel range and reassign pixels corresponding to a percentage stack within the stack level to the normalized pixel level.
22. The television of claim 21 wherein the programmable logic is further configured to apply a color correction factor to the expanded distribution of pixels.
23. The television of claim 12 wherein the programmable logic is further configured to apply a color correction factor to the expanded distribution of pixels.
Unknown
October 2, 2012
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